Received: 22 January 2020
Accepted: 16 December 2020
First Online: 15 January 2021
Ethical approval and consent to participate
: Letter of ethical clearance was obtained from Bahir Dar University, Department of Statistics and submitted to the University of Gonder Teaching Referral Hospital to get permission to conduct the research. This study was developed in accordance with established legislation and complies with the norms of good clinical practice, and informed consent was being not necessary as personal identifying information was kept separate from the research data. Finally, the study protocol was approved by the ethics committee or medical directors of the University of Gonder Teaching Referral Hospital.
: Not applicable.
: The authors declare that they have no competing interests.